[ 38a ] 



XLIV. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from p. 307.] 



June 22nd, 1892.— W. H. Hudleston, Esq., M.A., F.R.S., 

 President, in the Chair. 



r PHE following communications were read: — 



■*- 1. "Contribution to a Knowledge of the Saurischia of Europe 



and Africa." By Prof. H. G. Seeley, F.R.S., F.G.S. 



2. "Mesosauria from South Africa." By Prof. H. G. Seeley, 

 F.R.S., F.G.S. 



3. " On a new Eeptile from Welte Vreden, Eunotosaurus africanus 

 (Seeley)." By Prof. H. G. Seeley, F.R.S., F.G.S. 



4. "The Dioritic Picrite of White Hause and Great Cockup." 

 By J. Postlethwaite, Esq., F.G.S. 



The rock, which is about two miles N.E. of the Little Knott rock, 

 formerly described by Prof. Bonney, was referred to by the author as 

 " a large mass of hornblende picrite of like nature " to the Little 

 Knott rock, in a paper published in the 'Transactions' of the 

 Cumberland and Westmorland Association for 1889-90. Micro- 

 scopic examination by Prof. Bonney of the rock which is the subject 

 of the present communication confirms this determination. 



The metamorphism observable around this mass is considerably 

 larger than that seen round the Little Knott mass. 



5. " On the Structure of the American Pteraspidian, PaUeaspis 

 (Claypole), with Remarks on the Family." By Prof. E. W. Clay- 

 pole, B.A., D.Sc, F.G.S. 



6. " Contributions to the Geology of the Wengen and St. Cassian 

 Strata in Southern Tyrol." By Maria M. Ogilvie, B.Sc. 



In the first part of this paper the authoress gives a summary of 

 previous investigations and speculations respecting the sequence and 

 fossils of the Triassic rocks of the well-known Dolomitic region of 

 Southern Tyrol ; more especially with reference to the famous fossil- 

 bearing strata of the neighbourhood of St. Cassian. The different 

 views which have been advanced with regard to the actual mode of 

 formation of these strata, and their proper classification, since thet 

 appearance of the classical works of Yon Bichthofen and Mosjisovics, 

 are indicated, and their geological significance discussed. 



In the main body of the paper the authoress gives a generalized 

 account of the results of her own personal study of these strata 

 during the years 1891-1892, illustrating her conclusions by maps and 

 sections. Three areas have been partly mapped in detail, on the scale 

 of 1 : 25000, and the various fossiliferous zones have been traced on 

 the ground. The range and nature of the faults, &c., have in this 

 way been determined. 



The typical area of Prelongei and St. Cassian is first described in 

 detail, and from a careful mapping of the ground and a study of the 

 fossils the authoress reaches the conclusion that the St. Cassian 



